Tsuneo Iwami (SPOILERS)

After forcing Kiryu and Someya to fight under the threat of killing Someya’s wife, Iwami forces Kiryu and Someya to kill each other, stating that Someya’s wife will be killed otherwise… and, after Someya committs seppuku in an attempt to save his wife, Iwami decides to have Koshimizu, one of his henchmen, kill Someya’s wife anyways purely out of spite.

Example of:
Complete Monster